CZC AUTO Trailer Hitch Coupler Lock Pin — 4-Pack Black, 1/4" Dia 3/4" Span Keyed-Alike

CZC AUTO's black trailer hitch coupler lock pin is a compact, keyed-alike security pin (1/4" diameter, 3/4" span) designed to prevent unauthorized hitching for boats, RVs, trucks and trailers.

This compact coupler lock pin provides a simple mechanical barrier that fits common trailer tongues and couplers. The set includes four identical keyed pins so you can secure multiple trailers or spare pins without carrying extra keys. Built from high-strength steel and finished with corrosion-resistant black electrophoretic paint, the pin balances portability with everyday protection for short-term stops and storage.

How does this hitch pin lock fit my trailer or coupler?

The pin measures 1/4 inch in diameter and has an effective 3/4 inch span, suitable for many standard coupler holes and securing latch assemblies. Check your coupler hole diameter and the available clearance to ensure the 3/4 inch span will engage across the latch or receiver. The small footprint is intended for tongue-style couplers where a short pin can block the latch movement.

• Pin diameter: 1/4 inch — matches common coupler holes
• Effective span: 3/4 inch — designed for short latch gaps
• Four keyed-alike pins — same key for each included pin
• Compact size — easy to stow in glove box or pocket

What level of protection does the CZC AUTO coupler pin provide?

This pin offers a deterrent against casual theft and opportunistic tampering by immobilizing the coupler latch. It’s constructed from high-strength steel to resist bending and snapping under light to moderate force and finished with a corrosion-resistant coating for outdoor use. While not an invincible anti-theft device, it raises the effort required to unlawfully hitch your trailer.

• High-strength steel core — increases toughness
• Black electrophoretic paint — guards against rust in wet conditions
• Keyed-alike convenience — reduces key juggling across trailers
• Simple mechanical action — quick install and removal

How do I operate the keyed coupler lock pin?

Operation is straightforward: insert the pin through the coupler hole and turn the flat key 5–7 times to lock or unlock the mechanism. The flat key design is compact and easy to handle, and the keyed-alike set means one key opens all four pins. Keep a spare key in a secure location to avoid lockout situations.

• Insert pin through coupler hole
• Rotate flat key 5–7 full turns to secure or release
• All four pins use the same key — one-key convenience
• Recommended: verify fit before relying on for long-term storage

What vehicles and situations are these pins best suited for?

These coupler lock pins are intended for use on trailers, tow boats, RVs, trucks and cars where a short locking pin can block the coupler latch. They are ideal for daytime stops, short-term storage, and adding another physical barrier when loading or unloading. Confirm the hole diameter and span compatibility before purchasing to ensure a proper fit.

• Use with small to medium trailers and boat trailers
• Good for RV trailer tongue latches and utility trailers
• Designed for short-term security and deterrence
• Four-pack lets you protect multiple vehicles or keep spares

Who is this for: The CZC AUTO 1/4" diameter, 3/4" span keyed-alike coupler lock pin suits owners of tow boats, utility trailers, RVs and trucks who want a portable, easy-to-use deterrent against unauthorized hitching. It’s especially useful if you need the convenience of one key for several pins and prefer a low-profile, corrosion-resistant steel pin for everyday use. Verify coupler measurements before purchase to ensure compatibility.